Portable electric coal-mining machine



J. B. SNEATHEN, A. MICHAELS 8; M. A. MIGHALBS PORTABLE'BLEGTRIG GOAL MINING MACHINE. No, 375,390. Patented Dec. 27, 18-87;.

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UNITED STATES PATENT OEEIcE.

JOHN B. SNEATHEN AND ALBERT MIOHAELS, OF PITTSBURG, AND MOSES A. MIOHALES, OF ALLEGHENY, PENNSYLVANIA.

PORTABLE ELECTRIC COAL-MINING MACHlNE.

SPECIFICATION forming part of Letters Patent No. 375,390, dated December 27 1887.

Application filed December 31, 1886. Serial No. 223,160. (No model.)

To all whom it may concern.-

Ile it known that we, JOHN B. SNEATHEN and ALBERT MIOHAELS, of Pittsburg, and MosEs A. MIOHALES, of Allegheny, in the county of Allegheny and State of Pennsylvania, citizens of the United States, have invented or discovered certain new and useful Improvements in Portable Electric Coal-Mining Machines, ofwhich improvements the following is a specification.

In the accompanyingdrawings, which make part of this specification, Figure 1 is a View in side elevation of our improved portable power drill or cutter. Fig. 2 is a top plan view of the same. Fig. 3 is a rear end elevation, the motor being removed. Fig. 4 is a transverse sectional view on the line a m, Fig. 1, looking in the direction of the arrow. Figs. 5 and 6 are views in side and end elevation of different forms of drills. Fig. 7 is a detail view of one end of the connecting-rod. Fig. 8 is a sectional view of the rear bearing of the drill or cutter bar.

The invention herein relates to certain improvements in portable drilling apparatus capable of being carried from place to place and held while in operation by one or two men, and,

or support therefor, and it is extremely difficult to regulate the force of the blow of the drill or cutter to the work to be performed.

The object of the invention herein is to so construct a drill or cutting apparatus that the drill or cutting-tool and its operating mechanism can be not only easily transported fromplace to place by one or two operatives, but can also be supported and. held in proper position during operation, the device being so constructed that the result obtained. in the class of machines above mentioned by the power or force of the blows of the drill is obtained in our device by the number or rapidity of blows delivered.

said head being provided with an arm or projection, 6, through which the bar 3 passes, said bar being held as against longitudinal movementindependent of the head by the collars 7,

secured to the bar on opposite sides of the arm or projection. Near the rear end of the bedplate is arranged an electric motor, A, having I a disk, 8, secured to the inner end ofits armature-shaft 9, said disk being provided with a crank-pin, 10, connected by the rod 11 to the reciprocating head 5. A pinion, 12, is keyed to the shaft 9 at a point between the motor and the disk 8, said pinion intermeshing with a gear-wheel, 13, on the counter shaft 14, mounted in suitable bearings, 15, attached to the bed-plate 2, and provided with a worm, 16,- at the end extending under the bar 3. This worm engages a gear-wheel, 17, mounted on the bar 3, and provided with a hub, 18, extending through the'rear bearing, 1. The gear and hub are connected to the bar 3 by aspline and feather, 19, thereby causing the bar to rotate withv the gear, but permitting of a free longitudinal movement thereof through the hub, as will be clearly understood.

In using the above-described apparatus a suitable drill is secured in the socket 20 on the front end of the bar 3, and the motor electrically connected with a dynamo and any other suitable source of electric supply. The operator then holds the apparatus in proper relation to the place where the drilling or cutting is to be effected, gradually pushing the apparatus forward as the drilling proceeds. As the device is continually supported and fed forward by the hands of the operator, he is enabled to regulate the force of the blow in accordance with the work to be performed. In case a hard spot should be struck by the drill, the only effect would be either to stop the motor or push the device backward against the yielding pressure exerted by the hands of the operator.

The relative arrangement and construction of the parts of the apparatus herein described and shown may be considerably changed and modified without departing from the spirit of our invention.

\Ve claim herein as our invention- 1. In a portable drilling and cutting apparatus, the combination of a horizontal bedplate, a reciprocating drill mounted in suitable bearings thereon, an electric motor arranged on the bed-plate and having a crank and pitman connection with the drill-bar, and a train of gear from the motor to the drill-bar for rotating the latter, substantially as set forth.

2. A portable drill bed-plate,in combination with a reciprocating drill-bar mounted thereon, an electromotor having a crank and pitman connection with the drill-bar, and a train of gear from the motor to the drill-bar for rotating the latter, substantially as set forth.

In testimony whereof we have hereunto set our hands.

JOHN B. SNEATHEN. ALBERT MICHAELS. MOSES A. MIOHALES.

Witnesses:

DARWIN S. WoLeo'r'r, R. H. \VIIITTLEsEY. 

